Mattress Online Active Deals, Sales & Codes in June, 2026

Mattress Online has been trading since 2003, operating from its Yorkshire base where it also runs a showroom for those who prefer to try before they buy. It claims the title of the UK’s largest online mattress stockist, carrying roughly 18,000 options across dozens of brands including Silentnight, Simba, Relyon, and Flintshire Furniture.

The range covers every mainstream size — single, double, king, and European dimensions — in constructions from memory foam and pocket sprung to orthopaedic and natural-fill. Bed frames span wooden and metal designs, leather upholstery, and day beds, while accessories such as pillows, duvets, toppers, and headboards round out the catalogue. Double mattresses start from around £152, with budget-friendly options available under £500.

Several policies set Mattress Online apart from purely transactional competitors. A free 60-night trial lets you sleep on a mattress before committing fully, and free delivery applies to all orders. The old-mattress collection service, at £25, undercuts most council disposal fees. Klarna provides two finance routes: Pay Later in 3 (interest-free, on orders between £300 and £1,000) and 0% instalment plans over 6–12 months (minimum £500 spend). Newsletter subscribers receive access to exclusive offers not available elsewhere on the site.

Combined with sale discounts that regularly reach 55% off RRP, those policies — plus the occasional voucher code listed below — make it worth checking back before any purchase.

When is the best time to buy from Mattress Online?

Sale events deliver the deepest cuts — we’ve tracked up to 55% off RRP during major promotions. Black Friday and January sales tend to be the strongest periods, but Mattress Online runs rotating discounts year-round. If you’re not in a rush, bookmark this page and wait for the next sale; if your current mattress needs replacing immediately, the everyday discounts plus a voucher code still shave a useful amount off.

Memory foam or pocket sprung — which suits me?

Memory foam moulds to your body shape and suits side sleepers or anyone sharing a bed with a restless partner, since it absorbs movement. Pocket sprung mattresses offer more responsive support and better airflow — ideal if you tend to overheat at night. If you have joint pain, the orthopaedic options provide firmer support.

Can I combine a voucher code with sale prices?

Generally, Mattress Online applies one discount per order. A voucher code usually won’t stack on top of an already-reduced sale item. Compare the sale price against the code discount and go with whichever gives the bigger saving. With code T50 offering 50% off cot bed mattresses, check whether the sale or the code delivers the lower final price before committing.

Is the 60-night trial genuinely free?

Yes — there’s no extra charge for the trial. You sleep on the mattress for up to 60 nights, and if it doesn’t suit, you can arrange a return. Check current terms for any collection fees that might apply on returns.

What’s the smartest way to pay?

For baskets between £300 and £1,000, Klarna’s Pay Later in 3 splits the cost into three interest-free payments with no credit check. For orders above £500, 0% finance spreads payments over 6–12 months, subject to a credit check. If you can pay upfront, that’s simplest — but the interest-free terms are genuinely cost-free if you’re disciplined about repayments.